Air Conditioning System (Diagnostics - Introduction): Diagnosis Lexus RX III рестайлинг

HOW TO PROCEED WITH TROUBLESHOOTING [03/2012 - ]

HINT

1. Use the following procedure to troubleshoot the air conditioning system.
2. *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. INSPECT BATTERY VOLTAGE Inspect the battery voltage. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step. NEXT: Go to next step
3. CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM* Use the Techstream to check if the LIN communication system is functioning normally. Result Result Proceed to LIN DTC is not output A LIN DTC is output B B --> GO TO LIN COMMUNICATION SYSTEM A: Go to next step
4. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* Use the Techstream to check if the CAN communication system is functioning normally. Result Result Proceed to CAN DTC is not output A CAN DTC is output B B --> GO TO CAN COMMUNICATION SYSTEM A: Go to next step
5. CHECK FOR DTC* Check for DTCs and note any code that is output. Clear the DTCs. Recheck for DTCs. Based on the DTCs output above, try to force the A/C system to output DTCs by simulating the conditions indicated by the DTC. Result Result Proceed to DTC is output A DTC is not output B B --> Go to step 7 A: Go to next step
6. DIAGNOSTIC TROUBLE CODE CHART Find the output code in the diagnostic trouble code chart. Refer to «DIAGNOSTIC TROUBLE CODE CHART [03/2012 - ]»(ref-602709-S18379834512014030500000) . NEXT --> Go to step 9
7. PROBLEM SYMPTOMS TABLE Refer to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE [03/2012 - 07/2012]»(ref-602709-S14820398182014030500000) . Result Result Proceed to Fault is not listed in Problem Symptoms Table A Fault is listed in Problem Symptoms Table B B --> Go to step 9 A: Go to next step
8. OVERALL ANALYSIS AND TROUBLESHOOTING* Panel diagnosis (indicator check, sensor check). Refer to «DIAGNOSIS SYSTEM [03/2012 - ]»(ref-602709-S10864790532014030500000) Data List / Active Test. Refer to «DATA LIST / ACTIVE TEST [03/2012 - ]»(ref-602709-S32239137712014030500000) Terminals of ECU. Refer to «TERMINALS OF ECU [03/2012 - ]»(ref-602709-S22780211282014030500000) On-vehicle Inspection Inspection NEXT: Go to next step
9. ADJUST, REPAIR OR REPLACE NEXT --> END

PROBLEM SYMPTOMS TABLE [03/2012 - 07/2012]

HINT

1. Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
2. Inspect the fuses and relays related to this system before inspecting the suspected areas below.

AIR CONDITIONING SYSTEM

1. *1: w/ Smog Ventilation Sensor
2. *2: w/ Audio and Visual System (w/o Multi-display)
3. *3: w/ Audio and Visual System (w/ Multi-display without Parking Assist Monitor System)
4. *4: w/ Audio and Visual System (w/ Multi-display with Parking Assist Monitor System)
5. *5: w/ Navigation System

PROBLEM SYMPTOMS TABLE [07/2012 - ]

HINT

1. Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
2. Inspect the fuses and relays related to this system before inspecting the suspected areas below.

AIR CONDITIONING SYSTEM

1. *1: w/ Smog Ventilation Sensor
2. *2: w/ Audio and Visual System (w/o Multi-display)
3. *3: w/ Audio and Visual System (w/ Multi-display without Parking Assist Monitor System)
4. *4: w/ Audio and Visual System (w/ Multi-display with Parking Assist Monitor System)
5. *5: w/ Navigation System

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1. A/C AMPLIFIER HINT: Check from the rear of the connector while it is connected to the A/C amplifier. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition F50-1 (IG+) - F50-14 (GND) P - W-B Power source (IG) Engine switch on (IG) 11 to 14 V F50-1 (IG+) - F50-14 (GND) P - W-B Power source (IG) Engine switch off Below 1 V F50-2 (SOL+) - F50-14 (GND) SB - W-B A/C compressor solenoid operation signal Engine running A/C switch: on Blower switch: LO Pulse generation (See waveform 1) F50-5 (TAM) - F50-13 (SG-2) V - LG Ambient temperature sensor signal Engine switch on (IG) Ambient temperature: 25°C (77°F) 1.35 to 1.75 V F50-5 (TAM) - F50-13 (SG-2) V - LG Ambient temperature sensor signal Engine switch on (IG) Ambient temperature: 40°C (104°F) 0.9 to 1.2 V F50-6 (DGS) - F50-13 (SG-2)*1 SB - LG Smog ventilation sensor signal (HC, CO) After 30 seconds from engine switch on (IG) and sensor exposed to exhaust gas (HC, CO) 1.0 to 4.5 V F50-7 (FLOQ) - F50-13 (SG-2) Y - LG A/C flow sensor signal Engine switch on (IG) A/C switch: off 3.8 to 4.2 V F50-7 (FLOQ) - F50-13 (SG-2) Y - LG A/C flow sensor signal Engine switch on (IG) A/C switch: on Blower switch: HI 0.7 to 3.8 V F50-8 (LOCK) - F50-13 (SG-2) LG - LG A/C compressor lock sensor signal Engine running Blower switch: LO A/C switch: on Pulse generation (See waveform 2) F50-9 (PRE) - F50-13 (SG-2) W - LG A/C pressure sensor signal Start engine, Operate A/C system, Refrigerant pressure: Abnormal pressure (more than 3140 kPa (32.0 kgf/cm 2 , 455 psi)) 4.84 V or higher F50-9 (PRE) - F50-13 (SG-2) W - LG A/C pressure sensor signal Start engine, Operate A/C system, Refrigerant pressure: Abnormal pressure (less than 196 kPa (2.0 kgf/cm 2 , 28 psi)) Below 0.73 V F50-9 (PRE) - F50-13 (SG-2) W - LG A/C pressure sensor signal Start engine, Operate A/C system, Refrigerant pressure: Normal pressure (less than 3140 kPa (32.0 kgf/cm 2 , 455 psi) and more than 196 kPa (2.0 kgf/cm 2 , 28 psi)) 0.73 to 4.84 V F50-10 (S5-3) - F50-13 (SG-2) P - LG Power supply for A/C pressure sensor Engine switch on (IG) 4.75 to 5.25 V F50-10 (S5-3) - F50-13 (SG-2) P - LG Power supply for A/C pressure sensor Engine switch off Below 1 V F50-11 (CANH) - F50-12 (CANL) B - W CAN communication system CAN communication circuit Pulse generation F50-13 (SG-2) - Body ground LG - Body ground Ground for A/C pressure sensor, A/C ambient temperature sensor, A/C lock sensor, smog ventilation sensor Always Below 1 V F50-14 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V F50-20 (MGC) - F50-14 (GND) BE - W-B A/C compressor magnetic clutch operation signal Engine switch on (IG) Blower switch: LO A/C switch: off 11 to 14 V F50-20 (MGC) - F50-14 (GND) BE - W-B A/C compressor magnetic clutch operation signal Engine switch on (IG) Blower switch: LO A/C switch: on Below 1 V F50-21 (B) - F50-14 (GND) G - W-B Power source (Back-up) Always 11 to 14 V F50-23 (BLW) - F50-14 (GND) L - W-B Blower motor speed control signal Engine switch on (IG) Blower switch: LO Pulse generation (See waveform 3) F50-29 (TR) - F50-34 (SG-1) BE - V Room temperature sensor signal Engine switch on (IG) Cabin temperature: 25°C (77°F) 1.8 to 2.2 V F50-29 (TR) - F50-34 (SG-1) BE - V Room temperature sensor signal Engine switch on (IG) Cabin temperature: 40°C (104°F) 1.2 to 1.6 V F50-30 (S5-1) - F50-13 (SG-2) BR - LG Power supply for A/C flow sensor Engine switch off Below 1 V F50-30 (S5-1) - F50-13 (SG-2) BR - LG Power supply for A/C flow sensor Engine switch on (IG) 4.5 to 5.5 V F50-32 (TSP) - F50-14 (GND) Y - W-B Solar sensor signal (for Front passenger side) Engine switch on (IG) Solar sensor subjected to electric light 0.8 to 4.3 V F50-32 (TSP) - F50-14 (GND) Y - W-B Solar sensor signal (for Front passenger side) Engine switch on (IG) Solar sensor covered with a cloth Below 0.8 V F50-33 (TSD) - F50-14 (GND) R - W-B Solar sensor signal (for Driver side) Engine switch on (IG) Solar sensor subjected to electric light 0.8 to 4.3 V F50-33 (TSD) - F50-14 (GND) R - W-B Solar sensor signal (for Driver side) Engine switch on (IG) Solar sensor covered with a cloth Below 0.8 V F50-34 (SG-1) - Body ground V - Body ground Ground for room temperature sensor Always Below 1 V F50-37 (LIN1) - F50-14 (GND) SB - W-B LIN communication signal Engine switch on (IG) Pulse generation F51-3 (DGS1) - F50-14 (GND)*1 B - W-B Smog ventilation sensor signal (NOx) After 30 seconds from engine switch on (IG) and sensor exposed to exhaust gas (NOx) 1.0 to 4.5 V z6-2 (BUSG) - Body ground - Ground for BUS IC Always Below 1 V z6-3 (BUS) - z6-2 (BUSG) - BUS IC control signal Engine switch on (IG) Pulse generation z6-4 (BBUS) - z6-2 (BUSG) - Power supply for BUS IC Always 11 to 14 V z6-5 (SG) - Body ground - Ground for evaporator temperature sensor Always Below 1 V z6-6 (TE) - z6-5 (SG) - A/C evaporator temperature sensor signal Engine switch on (IG) Evaporator temperature: 0°C (32°F) 1.7 to 2.1 V z6-6 (TE) - z6-5 (SG) - A/C evaporator temperature sensor signal Engine switch on (IG) Evaporator temperature: 15°C (59°F) 0.9 to 1.3 V *1: w/ Smog Ventilation Sensor Waveform 1: Item Content Terminal No. F50-2 (SOL+) - F50-14 (GND) Tool Setting 5 V/DIV., 500 μs/DIV. Vehicle Condition Engine running A/C switch: on Waveform 2: Item Content Terminal No. F50-8 (LOCK) - F50-13 (SG-2) Tool Setting 200 mV/DIV., 10 ms./DIV. Vehicle Condition Engine running Blower switch: LO A/C switch: on Waveform 3: Item Content Terminal No. F50-23 (BLW) - F50-14 (GND) Tool Setting 1 V/DIV., 500 μs/DIV. Vehicle Condition Engine switch on (IG) Blower switch: LO
2. MULTI-MEDIA MODULE RECEIVER ASSEMBLY (A/C CONTROL PANEL) (w/ Navigation System). Refer To «TERMINALS OF ECU [03/2012 - ]»(ref-602796-S08863943652014030500000)
3. MULTI-MEDIA MODULE RECEIVER ASSEMBLY (A/C CONTROL PANEL) (w/ Audio and Visual System (w/ Multi-display with Parking Assist Monitor System)). Refer to «TERMINALS OF ECU [03/2012 - ]»(ref-602786-S22476420232014030500000)
4. RADIO RECEIVER ASSEMBLY (A/C CONTROL PANEL) (w/ Audio and Visual System (w/ Multi-display without Parking Assist Monitor System)). Refer to «TERMINALS OF ECU [03/2012 - ]»(ref-602793-S23915071262014030500000)
5. RADIO RECEIVER ASSEMBLY (A/C CONTROL PANEL) (w/ Audio and Visual System (w/o Multi-display)) HINT: Check from the rear of the connector while it is connected to the radio receiver assembly (A/C control panel). Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition G7-1 (B) - Body ground V - Body ground Power source (Back-up) Always 11 to 14 V G8-5 (TX+) Y AVC-LAN communication signal - - G8-9 (GND) - Body ground BR - Body ground Ground for radio receiver (A/C control panel) Always Below 1 V G8-13 (TX-) W AVC-LAN communication signal - - G8-16 (ACC) - G8-9 (GND) GR - BR Power source (ACC) Engine switch off Below 1 V G8-16 (ACC) - G8-9 (GND) GR - BR Power source (ACC) Engine switch on (ACC) 11 to 14 V
6. MULTI-DISPLAY ASSEMBLY (w/ Navigation System) Refer To «TERMINALS OF ECU [03/2012 - ]»(ref-602796-S08863943652014030500000)
7. MULTI-DISPLAY ASSEMBLY (w/ Audio and Visual System (w/ Multi-display with Parking Assist Monitor System)) Refer to «TERMINALS OF ECU [03/2012 - ]»(ref-602786-S22476420232014030500000)
8. MULTI-DISPLAY ASSEMBLY (w/ Audio and Visual System (w/ Multi-display without Parking Assist Monitor System)) Refer to «TERMINALS OF ECU [03/2012 - ]»(ref-602793-S23915071262014030500000)
9. ACCESSORY METER ASSEMBLY (w/ Audio and Visual System (w/o Multi-display)) Refer to «TERMINALS OF ECU [03/2012 - ]»(ref-602745-S12994007382014030500000)

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1. DESCRIPTION Air conditioning system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform troubleshooting.
2. CHECK DLC3 Check the DLC3. Refer to «GENERAL INFORMATION [03/2012 - ]»(ref-602551-S10595751552014030500000) .
3. LIST OF OPERATION METHODS By operating each of the air conditioning control switches as shown in the diagram below, it is possible to enter diagnostic check mode.
4. INDICATOR CHECK Turn the engine switch off. Turn the engine switch on (ACC) and wait at least 5 seconds. Turn the engine switch on (IG) while pressing the A/C control panel "Passenger TEMP up" switch and "Recirculation/Fresh" switch simultaneously. Hold both switches until the indicator check screen appears. TEXT IN ILLUSTRATION *1 Multi-media Module Receiver Assembly (w/ Audio and Visual System (w/ Multi-display with Parking Assist Monitor System)) *2 Multi-media Module Receiver Assembly (w/ Navigation System) *3 Radio Receiver Assembly (w/ Audio and Visual System (w/o Multi-display)) *4 Radio Receiver Assembly (w/ Audio and Visual System (w/ Multi-display without Parking Assist Monitor System)) The indicator check is automatically performed when panel diagnosis is activated. Check that the indicators light up and go off 4 times at 1 second intervals. HINT: The sensor check automatically starts when the indicator check is completed. Press the "OFF" switch to cancel check mode. TEXT IN ILLUSTRATION *1 Multi-display Assembly (w/ Audio and Visual System (w/ Multi-display with Parking Assist Monitor System)) *2 Multi-display Assembly (w/ Navigation System) *3 Accessory Meter Assembly (w/ Audio and Visual System (w/o Multi-display)) *4 Multi-display Assembly (w/ Multi-display without parking Assist Monitor System)) *5 Multi-media Module Receiver Assembly (w/ Audio and Visual System (w/ Multi-display with Parking Assist Monitor System)) *6 Multi-media Module Receiver Assembly (w/ Navigation System) *7 Radio Receiver Assembly (w/ Audio and Visual System (w/o Multi-display)) *8 Radio Receiver Assembly (w/ Audio and Visual System (w/ Multi-display without Parking Assist Monitor System))
5. SENSOR CHECK (DTC CHECK) Start the engine and warm it up. Perform the indicator check. HINT: After the indicator check is completed, the system enters DTC check mode automatically. Read the DTC displayed on the accessory meter display. NOTE: In sensor check mode, which is automatically entered after indicator check mode, troubleshooting may be partially performed. Be sure to perform the sensor check again. HINT: Refer to Diagnostic Trouble Code Chart for details of the codes. Refer to «DIAGNOSTIC TROUBLE CODE CHART [03/2012 - ]»(ref-602709-S18379834512014030500000) . When there are no problems, DTC 00 is output. As an example, the illustration shows that display DTC 12 is output. TEXT IN ILLUSTRATION *1 Multi-display Assembly (w/ Audio and Visual System (w/ Multi-display with Parking Assist Monitor System)) *2 Multi-display Assembly (w/ Navigation System) *3 Accessory Meter Assembly (w/ Audio and Visual System (w/o Multi-display)) *4 Multi-display Assembly (w/ Multi-display without parking Assist Monitor System) *5 Diagnostic Trouble Code (DTC) - - If the steps are difficult to read because they change automatically, press the "FRONT DEF" switch to display the steps one at a time so that they can be read easily. The items are displayed step by step each time the "FRONT DEF" switch is pressed. HINT: Press the "OFF" switch to finish panel diagnosis. TEXT IN ILLUSTRATION *1 Multi-media Module Receiver Assembly (w/ Audio and Visual System (w/ Multi-display with Parking Assist Monitor System)) *2 Multi-media Module Receiver Assembly (w/ Navigation System) *3 Radio Receiver Assembly (w/ Audio and Visual System (w/o Multi-display)) *4 Radio Receiver Assembly (w/ Audio and Visual System (w/ Multi-display without Parking Assist Monitor System)) Clear the DTC During the sensor check, press the "FRONT DEF" switch and "REAR DEF" switch simultaneously. TEXT IN ILLUSTRATION *1 Multi-media Module Receiver Assembly (w/ Audio and Visual System (w/ Multi-display with Parking Assist Monitor System)) *2 Multi-media Module Receiver Assembly (w/ Navigation System) *3 Radio Receiver Assembly (w/ Audio and Visual System (w/o Multi-display)) *4 Radio Receiver Assembly (w/ Audio and Visual System (w/ Multi-display without Parking Assist Monitor System))

DTC CHECK / CLEAR [03/2012 - ]

1. DTC CHECK USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes. Check for DTCs.
2. DTC CLEAR USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes. Clear the DTCs by pressing the YES button on the Techstream display.

DATA LIST / ACTIVE TEST [03/2012 - ]

1. DATA LIST Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time. NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Data List. Check the value(s) by referring to the table below. AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Room Temperature Sensor Room temperature sensor / Min.: -6.5°C (20.3°F) Max.: 57.25°C (135.05°F) Actual cabin temperature displayed - Ambient Temp Sensor Ambient temperature sensor / Min.: -23.3°C (-9.94°F) Max.: 65.95°C (150.71°F) Actual ambient temperature displayed - Adjusted Ambient Temp Adjusted ambient temperature / Min.: -30.8°C (-23.44°F) Max.: 50.8°C (123.44°F) - - Evaporator Temp Sensor Evaporator temperature sensor / Min.: -29.7°C (-21.46°F) Max.: 59.55°C (139.19°F) Actual evaporator temperature displayed - Evaporator Fin Thermistor Evaporator temperature sensor / Min.: -29.7°C (-21.46°F) Max.: 59.55°C (139.19°F) Actual evaporator temperature displayed - Evaporator Target Temp Evaporator target temperature / Min.: -327.68°C (-557.82°F) Max.: 327.67°C (621.81°F) Evaporator target temperature displayed - Solar Sensor (D Side) Driver side solar sensor / Min.: 0 Max.: 255 Driver side solar sensor value increases as brightness increases - Solar Sensor (P Side) Passenger side solar sensor / Min.: 0 Max.: 255 Passenger side solar sensor value increases as brightness increases - Engine Coolant Temp Engine coolant temperature sensor / Min.: 1.3°C (34.34°F) Max.: 90.55°C (194.99°F) Actual engine coolant temperature displayed - Set Temperature (D Side) Driver side set temperature / Min.: MAX COLD Max.: MAX HOT Driver side actual set temperature displayed - Set Temperature (P Side) Passenger side set temperature / Min.: MAX COLD Max.: MAX HOT Passenger side actual set temperature displayed - Blower Motor Speed Level Blower motor speed level / Min.: 0 Max.: 31 Displayed speed level increases in range between 0 and 31 as blower motor speed increases - Emission Gas Nox Sensor*1 Emission gas / Min.: 0 Max.: 255 Smog ventilation sensor value increases as gas amount increases - Emission Gas Sensor*1 Emission gas / Min.: 0 Max.: 255 Smog ventilation sensor value increases as gas amount increases - Regulator Pressure Sensor Air conditioning pressure sensor / Min.: -66.22 psi (gauge) Max.: 477.68 psi (gauge) Actual regulator pressure displayed - Regulator Control Current Regulator control current / Min.: 0 A Max.: 0.997 A Value changes between 0 A and 0.997 A in accordance with compressor and magnetic clutch operation - Air Mix Servo Targ Pulse(D) Driver side air mix servo motor target pulse / Min.: 0 Max.: 255 MAX. COLD: 5 (pulse) MAX. HOT: 103 (pulse) - Air Mix Servo Actual Pulse(D) Driver side air mix servo motor actual pulse / Min.: 0 Max.: 255 MAX. COLD: 5 (pulse) MAX. HOT: 103 (pulse) - Air Mix Servo Targ Pulse(P) Passenger side air mix servo motor target pulse / Min.: 0 Max.: 255 MAX. COLD: 105 (pulse) MAX. HOT: 7 (pulse) - Air Mix Servo Actual Pulse(P) Passenger side air mix servo motor actual pulse / Min.: 0 Max.: 255 MAX. COLD: 105 (pulse) MAX. HOT: 7 (pulse) - Air Outlet Servo Pulse (D) Air outlet servo motor target pulse / Min.: 0 Max.: 255 FACE: 8 (pulse) B/L: 30 to 38 (pulse) FOOT: 50 to 74 (pulse) FOOT/DEF: 80 (pulse) DEF: 97 (pulse) - Air Outlet Servo Actu Pulse (D) Air outlet servo motor actual pulse / Min.: 0 Max.: 255 FACE: 8 (pulse) B/L: 30 to 38 (pulse) FOOT: 50 to 74 (pulse) FOOT/DEF: 80 (pulse) DEF: 97 (pulse) - Air Inlet Damper Targ Pulse Air inlet servo motor target pulse / Min.: 0 Max.: 255 RECIRCULATION: 7 (pulse) FRESH: 28 (pulse) - Air Inlet Damper Actual Pulse Air inlet servo motor actual pulse / Min.: 0 Max.: 255 RECIRCULATION: 7 (pulse) FRESH: 28 (pulse) - Shift Set Temperature Shift set temperature / 2C incr, 1C incr, Normal, 1C decr or 2C decr Customized value displayed - Compressor Mode Compressor mode / Auto or Manual Customized value displayed - Evaporator Control Evaporator Control / Auto or Manual Customized value displayed - Emission Gas Sensor Shift*1 Emission Gas Sensor Shift/ More, Mu Less, Less, Li Less, Li More, Mu More or Normal Customized value displayed - ECO MODE Cancel ECO MODE Cancel / ON or OFF Customized value displayed - Foot/DEF Auto Mode Foot/DEF Auto Mode / ON or OFF Customized value displayed - Foot/DEF Auto Blow Up Foot/DEF Auto Blow Up / ON or OFF Customized value displayed - Flow Sensor A/C mass flow sensor / Min.: 0 V Max.: 5 V A/C on, Blower switch HI: 0.7 to 3.8 V A/C off, Blower switch off: 3.8 to 4.2 V A/C mass flow sensor is malfunctioning when a constant value between 0.7 and 4.2 V is displayed continuously for more than 4 seconds. A/C Cutoff Signal A/C control cutoff signal / OFF or ON A/C switch on: OFF A/C switch off: ON - Number of Trouble Codes Number of trouble codes / Min.: 0 Max.: 255 Number of DTCs displayed - *1: w/ Smog Ventilation Sensor
2. ACTIVE TEST Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Active Test. Check the operation by referring to the table below. AIR CONDITIONER Tester Display Test Part Control Range Diagnostic Note Blower Motor Blower motor Min.: 0, Max.: 31 - Magnetic Clutch Relay A/C compressor OFF, ON - Defogger Relay (Rear) Defogger relay (Rear) OFF, ON - Air Mix Servo Targ Pulse(D) Air mix servo motor pulse (D side) Min.: 0, Max.: 255 - Air Mix Servo Targ Pulse(P) Air mix servo motor pulse (P side) Min.: 0, Max.: 255 - Air Outlet Servo Pulse (D) Air outlet servo motor pulse Min.: 0, Max.: 255 - Air Inlet Damper Targ Pulse Air inlet damper target pulse Min.: 0, Max.: 255

DIAGNOSTIC TROUBLE CODE CHART

AIR CONDITIONING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

1. *1: If the cabin temperature is approx. -18.6°C (-1.48°F) or lower, DTC B1411/11 may be output even though the system is normal.
2. *2: If the ambient temperature is approx. -52.9°C (-63.22°F) or lower, DTC B1412/12 may be output even though the system is normal.